baggman

Try a JTM45/early JCM800 split channel preamp - if you'll compare the schematics in Dr Tube's Marshall section, it'll be obvious what you need to change for bass use. Keep in mind that those amps are just ever-so-slightly modified Tweed Bassmans, so you can't go far wrong. The B15 is great, too, but doesn't grind quite as hard. Both pretty simple to build, so pick yer poison.

Thanks, lovekraft! That's a great idea! And would be perfect! -baggman

Who has the simplest tube pre-amp plans for a bass amp. I want to build a hybrid bass amp for small gigs and recording. I guess something like an old Bassman, or Ampeg B-15 would do the trick. Thanks-baggman

I've kind of gone crazy(or so it would seem) with an old Gibson-Epiphone EB-O style bass. First I split the original humbucker so that I have 4 wires coming out. These 4 wires will go to a push-pull type pot(500k) that will be in the tone control position. I'm going to wire the switch to a series-parallel configuration. From there I'll go to the volume control(500k). I was wondering about putting a "treble bleed" circuit(a simple one using just a cap) across the "hot" legs of the volume control. Does anyone have any suggestions about what value cap I should use in this application. I'm trying to get as many tone variants from this bass without altering its appearance? Am I Crazy? Oh yeah, from the volume control I'll go back to the(500k and .047mF cap) tone control. -baggman